Elle Macpherson is the proud owner of an envy-inducing $8.1million mansion and one look at her swimming pool is enough to make you want to dive right in.The Australian model recently celebrated her 57th birthday, but judging by her physique you wouldn't have known it. MORE: Elle Macpherson shares incredibly rare photo of her son FlynnElle featured on Architectural Digest's Instagram - in a now-deleted post - and was seen walking around the edge of the luxury pool, wearing a white bikini.They